1、I CEN EN*ISO*9944 95 3404589 OLL2535 534 ? BRITISH STANDARD Plastics - Phenolic resins - Determination of electrical conductivity of resin extracts The European Standard EN IS0 9944 : 1995 has the status of a British Standard BS EN IS0 9944 : 1995 BS 2782 : Part 4 : Method 451Q : 1995 CEN EN*ISO*944
2、 95 I 3404589 OLL253b 470 I . BS EN IS0 9944 : 1995 This British Standard, having been prepared under the direction of the Materiais and Chemicals Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1995 O BSI 1995 The following ES1 references
3、relate to the work on this standard: Committee reference PRI/42 Draft for comment 89/37065 DC ISBN058023490 Committees responsible for this British Standard The preparation of this British Standard was entrusted to lechnical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, upo
4、n which the following bodies were represented: British Plastics Federation Chemical Industries Association Department of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) Electrical and Electronic Insulation Association (BEAMA Ltd.) Eur
5、opean Resin Manufacturers Association Ministry of Defence Motor Industry Research Association MPRA Ikchnology Ltd. Amendments issued since publication Amdm No. I Date I lkXt affected CEN EN*ISO*9944 95 E 3404589 0332537 307 BS EN IS0 9944 : 1995 National foreword This British Standard has been prepa
6、red by Echnical Committee PRI/42 and is the Englich language version of EN IS0 9944 : 1995 Plastics - Phenolic resins - Determination of electrical conductiwity of resin extracts, published by the European Committee for Standardization (CEN), which is identical with IS0 9944 : 1990 published by the
7、International Organization for Standardization It is incorporated into BS 2782 : part 4 Methods of testing plastics - Chemical Properties as Method 451Q. Compliance with a British Standard does not of itself confer immunity from legal obligations. (ISO) . i 1) CEN EN*IS0*9944 95 3404587 01,32538 243
8、 m EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 9944 August 1995 ICs 83.080.10 Descriptors: Plastics, thermosetting resins, Phenoplasts, tests, electrical tests, determination, conductivity English version Plastics - Phenolic resins - Determination of electrical conductivity of resin ext
9、racts (IS0 9944 : 1990) Plastiques - Rsines phnoliques - Dtermination de la de rsine Kunstsoffe - Phenolharze - Bestimmung Leitfhigkeit von Harzextrakten conductivit lectrique des xtraits (IS0 9944 : 1990) (IS0 9944 : 1990) This European Standard was approved by CEN on 1995-07-13. CEN members are bo
10、und to comply with the requirements of the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on
11、application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat
12、has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for St
13、andardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 Copyright reserved to all CEN members Ref. No. EN IS0 9944 : 1995 E CEN EN*ISO*9944 95 I 3Y04589 OLL2539 LBT Page 2 EN IS0 9944 : 1995 Foreword The text of the
14、International Standard from ISO/T 61, Plastics, of the International Organization for Standardization has been taken over as a European Standard by the kchnical Committee CEN/TC 249, Plastics. This European Standard shali be given the status of a national standard, either by publication of an identi
15、cal text or by endorsement, at the latest by February 1996, and conflicting national standards shall be withdrawn at the latest by February 1996. According to the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finlan
16、d, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. CEN EN*IS0*9944 95 R 3404589 OLL2540 9TL I . Page 3 EN IS0 9944 : 1995 Plastics - Phenolic resins - Determination of electrical conductivity of resin ext
17、racts 1 Scope This International Standard specifies a method for the determination of the electrical conductivity of phenolic resin extracts at 23 “C +_ 2 -C. The method is important for applications in which such resins are used as impregnating materials. 2 Principle An acetone/water mixture is add
18、ed to a solution of the resin. The precipitate thus produced is allowed to settle, and the conductance of the suspension re- maining above the resin is measured. The conduc- tivity is then calculated from the measured conductance. 3 Reagents 3.1 Acetone, reagent grade 3.2 Water, deionized, conductiv
19、ity less than or equal to 20 pS/m. 3.3 Acetoneldeionized-water mixture, containing 8 volumes of acetone (3.1) and 4 volumes of deionized water (3.2). 4 Apparatus 4.1 Conductivity cell, with known cell constant k 4.2 Conductance-measuring instrument, capable of measuring conductance to a minimum read
20、ing of 1 11s with a precision of 5 %, in the frequency range 50 Hz to 3000 Hz. Alternatively. a resistance- measuring instrument with the saine precision may be used. 4.3 Beaker, nominal capacity 250 ml 4.4 Magnetic stirrer. 4.5 Balance, scale interval I mg. 5 Procedure 5.1 Preparation of test porti
21、on In the case of resin solutions, weigh out 10 g 0,05 g of the solution into a 250 ,ml beaker (4.3). In the case of powdered solid resins, take 8 g of the resin and dissolve it in acetone (3.1) in a ratio by mass of 1:l. Weigh out 10 g 0,05 g of the resin solution thus obtained into a 250 rnl beake
22、r (4.3) 5.2 Determination Add 10 g of acetone (3.1) to the test portion prepared in 5.1. Stir the mixture with a magnetic stirrer (4.4) until the liquid is homogeneous. With vigorous stirring, add 100 ml of acetone/deionized-water mixture (3.3) in drops. Ad- just the dropping rate so that the resin
23、does Rot co- agulate but initially forms an emulsion. When all the acetone/water mixture has been added, stir for a further 3 min and then allow to settle for 3 min. Pour off the milky-turbid suspension above the resin into the conductivity cell (4 1) and bring the temperature of the suspension to 2
24、3C 2C. Measure the conductance of the suspension. but not for tonger than 3 min. WARNING - When measurements are mad, per- sistent contamination of the measuring cell may oc- cur. For this reason, the cell shall be cleaned and recalibrated before each measurement. Cleaning may be done by boiling in
25、concentrated acid or as described in Anal. Chern. Vol. 51, May 1978, page 741. 5.3 Alternative method In special cases, the following method may be used CEN EN*ISO*44 7.5 I 3404589 DLL254L 838 I Page 4 EN IS0 9944 : 1995 Place 8.0 g of resin in a 100 ml polyethylene vessel. Add 80 ml of deionized wa
26、ter (3.2) and extract for 20 h at 95C in an oven. Cool the sample to room temperature and measure the conductance (see 5.2). 5.4 Blank test Carry out a blank test under the same conditions with the same amounts of reagents, but omitting the resin. 6 Expression of results 6.1 Calculation The conducti
27、vity y of the phenolic resin solution. expessed in microsiernens per centirnetre, is given by the equation y = k(G1 - Go) where k is the cell constant, expressed in re- ci proca I cen ti m etres; Go is the conductance, in microsiemens, of the blank test solution (5.4): GI is the conductance, in micr
28、osiernens, of the resin suspension (see 5.2). Report the conductivity in rnicrosiernens per centi- metre, rounded to one decimal place. 6.2 Precision Repeatability (one operator, one apparatus): 10 %. Reproducibility (several operators, several sets of apparatus): 10 /O. 7 Test report The test repor
29、t shall include the following infor- mation: a) a reference to this International Standard; b) the type, identification and date of manufacture of the phenolic resin tested; c) the date of sampling; d) the conductivity of the phenolic resin solution and the conductances of the resin suspension and t
30、he blank test solution; e) any deviation, by agreement or otherwise, frorn the procedure specified; 9 the date of the test. . BS EN IS0 : 9944 : 1995 BS 2782 : Part 4 : Method 451Q : 1995 BSI 389 Chiswick High Road London W4 4AL CEN EN*IS0*9944 95 II 3404589 0332542 774 9511- 4- 0.5k- FP BSI - Briti
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